Doppler Correction Of The Telecommunications Payload Oscillators In The UK T-SAT

The article gives values for the doppler shift of an L-band radio path between a UK observer and a 12 h period Molnya orbit satellite. Two doppler correction units for the local oscillators of the UK T-SAT payload are described, one utilising frequency locking and the other phase locking. A critical assessment of the performance of each unit is given.